Nowadays, there are limitations in the understanding of insomnia in clinical medical science, however, clinical physicians have started to define insomnia based on clinical studies. In 2012, the Sleep Disorders Group of the Chinese Medical Association’s Neurology Branch developed the “Guidelines for the diagnosis and treatment of insomnia in Chinese adults” based on the available evidence-based medical evidence, in which insomnia is defined as a patient’s unsatisfactory sleep duration and/or quality and affects daytime social A subjective experience of unsatisfactory sleep duration and/or quality that affects daytime social functioning. What are the factors that affect insomnia? 1, environmental factors: noise or light, high temperature or cold, uncomfortable bedding such as too hard or too thick or too thin bedding can affect sleep, change of sleep environment such as hospitalization or hotel can also cause insomnia. 2, physiological factors: high-speed travel across several time zones (jet lag reaction), as well as from the day shift to night shift work, because the internal biological clock has not yet adapted to the new circadian rhythm, so also appear insomnia. 3, psychosocial many factors: stress and various life events can cause insomnia. Anxiety over one’s own or a loved one’s illness, fear of surgery, death of a loved one, worrying about exams or accepting an important job are all common causes of temporary insomnia. 4.Somatic diseases: various painful diseases, diseases that make people suffer for a long time, such as heart and lung diseases, arthritis, advanced cancer, nocturia, gastrointestinal diseases, kidney failure, hyperthyroidism, Parkinson’s disease, etc. often cause insomnia. 5, psychological diseases: depression, schizophrenia, Alzheimer’s disease, anxiety, obsessive-compulsive disorder, borderline personality disorder, etc. are often accompanied by insomnia symptoms. 6, drug factors: the most common drugs that cause insomnia are caffeine, theophylline and various stimulants, as well as alcohol and appetite suppressants, this type of insomnia is called rebound insomnia. 7, sleep concomitant disorders: such as nightmares night terrors. 8, primary sleep disorders: such as idiopathic insomnia, sleep phase delay or advance syndrome, sleep apnea syndrome. 9.Lack of insomnia experience: also known as sleep state misidentification, that is, to have slept mistaken for not slept, and some people will be fatigue as insomnia.